Improvement in furnaces for the manufacture of gas, and for other purposes



FQBARROLL.

re of Gas, and for Patented Novfih-JBJS.

Furnaces for the Manufactu other Purpos N0.144,506.

UNITED TATES FFIGE,

FRANCIS CARROLL, OF NEW ORLEANS, LOUISIANA.

IMPROVEMENT IN FURNACES FOR THE MANUFACTURE OF GAS, AND FOR OTHER PURPOSES.

Specification forming part of Letters Patent No. 144,506, dated November 11, 1873; application filed October 3Q, 1873.

To all whom it may concern:

Be it known that I, FRANCIS CARROLL, of New Orleans, in the State of Louisiana, have invented a certain new and useful Improvement in Furnaces for the Manufacture of Gas,

ever, applicable to furnaces in general, espe oially those in which a high heat is required to be uniformly kept up, or which are required to be replenished at short intervals, or to be kept open any length of time for cleaning out and clinkering. Wherever, as is usually the case,

a flue or chimney is used in comiection with a furnace, the inrush of cold air, which necessarily takes place as soon as the furnace-door is opened, produces a sudden lowering of the heat, with consequent waste of fuel and other resulting disadvantages. It is my object to avoid this difficulty, and to this end I so combine and connect the furnace-door with the chimney or flue damper that the opening of the door automatically closes the damper, thus shutting off the draft and effectually preventing any cold air from entering the furnace while the door remains open. 011 the other hand, the closing of the door automatically re-opens the damper, in which event the normal draft of the furnace is resumed. It is in this my invention.

Figure 1 is a view of the furnace with the door closed. Fig. 2 is a view of the same with the door open.

A is the furnace of any ordinary or suitable structure. B is the furnace-door. G is the chimney or flue. D is the damper, which, in this instance, is arranged to slide to and fro, so as to close or open the chimney or flue, as occasion demands. The axis or rod a, which holds the eyes on the door to the stationary eyes on the door-frame, so as to form a hinge in the usual way, is made fast to the door, and turns with it. This rod is prolonged to extend above the top of the furnace, and on its upper end has a crank-arm, I), provided with a wrist-pin, on which is hung one end of a connecting-rod, c, the other end of which is attached to the sliding damper. The crank, which has, of course, the requisite throw for the purpose for which it is designed, is fixed on the shaft or rod a in such position (as shown in Fig. 1) that when the door is closed it (the crank will be turned to retract the slidedamper from the flue or chimney opening. It will, therefore, be seen that when the door is thrown open, as seen in Fig. 2, the crank will make a half-revolution, and will, consequently, move the damper to the full extent in the direction requisite to close the flue or chimney. In this simple way is the result attained that I have in view, the damper being automatically operated to open or close the flue, according as the door is shut or opened, as hereinbefore stated.

The above is sufficient to indicate clearly the nature of my invention and the manner in which it may be carried into effect.

It will be manifest that the particular arrangement and construction of the intermediate mechanism connecting the door with the damper will vary according to the circumstances of the case, and the kind of furnace to which my invention is applied. It will also be understood that the damper need not necessarily slide, but may be hinged or otherwise arranged.

I repeat, therefore, that I do not limit myself to the special mechanical details herein set forth, for the purpose of enabling others to better understand and use my invention; but What I claim as my invention infurnaces 1s- The combination of the furnace-door and my name in the presence of two subscribing witnesses.

FRANCIS CARROLL.

Witn esses THEOBD. FORSTALLE, W. C. MOHRMANN. 

